Past obstetric history and risk of malignant breast neoplasms.

Many studies indicate hormonal disorders as a crucial reason for breast pathology. They are also probably responsible for the development of benign neoplasms and play a role in the origin and development of breast carcinoma. Although the mammary gland is under the influence of many steroid and peptide hormones such as thyroid hormones, prolactin, growth hormone, glucocorticosteroids, it is estrogen that plays an important role in the development of breast cancer. The purpose of the study was to analyze the obstetrical past of patients and the potential influence on the risk of developing malignant breast neoplasms. The participants in the study were healthy women with no changes in mammary glands (control group) and women with diagnosed malignant or benign breast neoplasms (study group). The total number of participants was 555 females aged 35-70 years. The study was carried out in the Greater Poland and Lubuskie province between 2005 and 2006. Hormonal disorders in childhood and puberty symptoms of early menarche play a crucial role in increasing the risk of malignant breast neoplasms. In women who experienced one or more miscarriages the risk of malignant breast neoplasms is significantly increased. On the basis of our study we calculated the odds ratio (OR) of malignant breast neoplasms among women who during lactation experienced problems needing medical intervention (OR = 2.25; 95% CI, 1.20-4.19) in comparison to women who experienced no problems).